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A London start-up developing child safety technology that can stop children sending dangerous messages even before they finish typing has raised millions from investors and sealed a deal with the German government to get its app onto the phones of thousands of children.

SafeToNet, which develops software that can limit what children access on their smartphone and prompt them if they are in a dangerous situation, raised £7m in cash at a £50m valuation from angel investors and current investor West Hill Capital. It brings its total raised to around £20m.

The company said it is planning to launch a new version of its technology that gives parents peace of mind over what their children are doing...